Honestly, I haven't found anything wrong witht the bolt. It, without a doubt, out performs the stock bolt. The combination of the open face and venturi styling is a concept that works. It is efficient. It is accurate. It is better. Some have said that the bolt is "sharp" on the edges and chops balls. I never had that problem. As long as you adjust the back block you should be okay. The pin design also is an improvement over the WGP style. As long as you don't take it a part you should be fine. I've notice that people always start complaining about things after they take them apart.